[Supras] mystery knock

[Rockey Fox]

The one time it clattered it did sound like a diesel rattling. Seems the mystery knock is more noticeable in colder weather. I parked
outside last night and started cold at 60 degrees f this morning and
barely noticed it.

----- Original Message ----
From: "Walker, Brian (Rich. Dist)" <Brian.Walker2 at VDOT.Virginia.gov>
To: supr91tt at yahoo.com; supras at supras.com
Cc: speedtoys.racing at gmail.com
Sent: Friday, April 20, 2007 8:22:55 AM
Subject: Re: [Supras] mystery knock

Re: [Supras] mystery knock


 
 




Seems like you might be describing a clatter from excessive tolerance when cold (I believe certain wirst pins can cause this but you said OEM) Does it sound like a Diesel firing up? Diesels run very high compression and a lot of heat. Due to this the pistons expand more so they must be toleranced accordingly to allow for this expansion when warm/hot. Race engines can do the same depending on the required piston clearance (different brands/mat'l makeup)




From: "Rockey Fox" <supr91tt at yahoo.com>


To: "Jeff Mohler" <speedtoys.racing at gmail.com>


Cc: <berniek at technicaldevelop.com>; <supras at supras.com>


Sent: Thursday, April 19, 2007 6:43 AM


Subject: Re: [Supras] mystery knock





>I tried it out this morning and the mild knock was not discernible except 


>when the engine is under load and boosting. It was only about 45 degrees f 


>outside this morning.












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